Kings Gambit Declined Keene Defense Discovered Check in Chess

In the Kings Gambit Declined Keene Defense, Black accepts the gambit structure and develops in a way that can set up a tactical shot. A “discovered check” here means White (or Black, depending on the line) uses a move that opens a line—often from a rook, bishop, or queen—so the newly revealed piece gives check immediately. The defining feature is the discovered line opening from behind a piece while the opponent’s king is already aligned on that line.